let arr = [1, 3, 43, 4];
console.log(Math.max(...arr));
let hd = {
  data: [1, 2, 3, 34, 5, 7]
};
console.log(Math.max.call(null, ...hd.data));
let xj = {
  lessons: { js: 87, php: 63, node: 99, linux: 88 }
};
console.log(Math.max.apply(null, Object.values(xj.lessons)));